Variabile globale python
Esempi di codice
variabile globale di accesso python
globvar = 0
def set_globvar_to_one():
global globvar # Needed to modify global copy of globvar
globvar = 1
def print_globvar():
print(globvar) # No need for global declaration to read value of globvar
set_globvar_to_one()
print_globvar() # Prints 1variabile globale non funzionante python
trying to assign a global variable in a function will result in the function creating a new variable
with that name even if theres a global one. ensure to declare a as global in the function before any
assignment.
a = 7
def setA(value):
global a # declare a to be a global
a = value # this sets the global value of avariabile globale python
#it is best not to use global variables in a function
#(pass it as an argument)
a = 'This is global a'
def yourFunction():
global a
return a[0:2]python globale
"""
USING GLOBALS ARE A BAD IDEA, THE BEST WAY TO PERFORM AN ACTION WHICH NEEDS GLOBALS WOULD
BE TO USE RETURN STATEMENTS. GLOBALS SHOULD ONLY EVER BE USED IN RARE OCCASIONS WHEN YOU
NEED THEM
"""
# allows you to modify a variable outside its class or function
EXAMPLE:
def test_function():
global x
x = 10
test_function()
print(f"x is equal to {x}") # returns x is equal to 10
variabile globale python
# Python global variable
# Probably should not use this, just pass in arguments
x = 0 # variable is in outer scope
print(x) # prints x (0)
def use_global_variables():
# if using a global variable, the variable will not need to be mention while calling the function
global x # calling the x variable from a function
x += 1
print(x) # prints x after adding one in the function (1)
use_global_variables
=============================================
# Output:
0
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